Mixing apparatus.



' hir/M5151 J. A. sVENsoN. r MIXING` APPARATUS.

` v APPLIOATION FILED JULY 13,1906.

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Patented Oct. 6, 1908.

J. A. SVENSON. MIXING4 APPARATUS. APPLIOATION FILED JULY 13, 1906.

,Patented oct. 6,1908.

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J A. SVENSON. MIXING'APPARATUS. APPLICATION IILD JULY 13, 1906.

Patented 00.2.16, 1908.

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' JOHN A. svENsoN, oEPI'iTsBURG, PENNSYLVANIA.

MIXING APPARATUS.

Specification of Letters Patent.

Patented oct. 190'8.

' Application med Jury 1s, 1906. serial No. 326,050.

To all whom it may concern: Be it known that. I, JOHN A. SvENsoN, a citizen of the United States, residing at Pitts-v` Pennsylvania, have invented certain new anduseful Improvements in Mixing Apparatus, of which the following is a s ecilication.

Concrete mixers may be roug y divided into two classes, t0 Wit, those in which the .mixing drum itself revolves, and those which com risea stationary semicircular troughin whi'cIh paddles carried `on a revolving shaft In the last named class of machines (to which the' em bodiment herein shown of my invention belongs), it usually becomes necessary to let the outer points of the mixing paddles revolve in- 4a circle considerably smaller than that of the y trough; thatis to say, the paddles do not touch the trough by about two inches, in order that the irregular pieces constituting thecoarser part 4of the mixture lmayvnot vwedge themselves between the addles and the trough and cause Stoppa' eor reaks. As- .25

aresult a la er of materia `alwa s remains on the insi e of the trough; w ch layer would, since water is.- added in the mixing process, become set and harden into an objectionable massif not periodically removed. lOrdinarily,,the la er of material referred to. is removed by and at the exV pense of considerablelabor and time. This invention rovides means for making the trough se #cleaning atintervals and while the apparatus is in operation.

I have mentioned the mixing of concrete merely by way of illustration, not intending to imply that the invention is limited to the In the accompanyin drawings Fi rel is -a longitudinal veriiical central slrlztion through amixing apparatus embodying the features of my invention. Figi 2 isa plan,`

view of said apparatus. Fig. S-is an elevation' of the forward end of the machine. c Fig 4 is a transverse section on dotted line 4 4 ofFigl. i o The embodiment herein shown'of this invention comprisesl a supporting frame consisting of. two longitudinal beams 1 joined together at their ends by two transverse beams 2.A Upon said'framer is 4sup orted a .pluralit of hoppersforreceiving -t e mate-` rials to emeasured and mixed. In the present embodiment there are threehoppers 3,

4, and 5, although itis a parent that agreater number-may be provi ed, if desired. 'The K `holppers 3 and 4 are separated from each burg, in the county of Allegheny and State' of ot d er b the partition 6, and the hoppers 4 y the partitions 7, 8 and 9. The l'ower or discharge ends of all of 'said hoppers communicate with a conical conveyer casing 10 secured to said hoppers in any suitable Way. In the hopper 3 re two vertical partitions 11, the space b Weeny said partltions communicating withthe conveyer casing 10. The hoppers 3, 4 and 5 and the conveyer casing 10 are supported upon the main Jf'rame by means of brace-arms 12 (Fig. 4).

A shaft 13 is rotatably supported upon the main frame in bearin s 14 carried by the transverse beams 2, sald shaft being rotated l by'ni'eans of a gear 15 driven Afrom any 'suitable source of power. Upon vsaid shaft is rotatably mounted a sleeve 16 'extending the length of the conveyer casing 10 and projectl In order to permit of varying the proporl' tions of the materials to be compounded, I provide/means for moving/the outlets from certain of the hoppers along the center line 'of theconveyer casing. Since the amount of material that may be fedinto the conveyer depends upon the diameter of the" screw beneath the outlet from the hopper, it will be seen that moving said hopper (or tie futllt a er en o t e therefrom) toward the screw permits an increased ow of material, and a movement of the hopper or outlet .i toward the smaller end of the screw will defloo crease the amount of material discharged means for the ho per 43 comprises a dia"-v phragm 19'pivota y mounted upon a shaft 20 supported in the partitions 11 said diahragm forming'one wall of the outlet and ing located at the sidev toward the larger 'end of the screw.` The diaphragm 21 for the hop er 4`.is ivoted u on a shaft 22 carried by t Ie partitions 7 an 8. The lower ends of f tually shift said opening along said screw),

. diaphragmv 19.

by means of a screw 23 supported in a crossf bar 24 extending from one of the partitions 11 to the other.- The upper endof the screw' 23 carries a hand wheel 25. The lower screw-threaded end of the screw-23 engages a nut 26 pivotally sup orted in ears 27 depending from an angu ar portion 28 of the A pointer 29 ixed to the diaphragm 19 near lts pivot serves to indicate upon any suitable scale (not shown) the ositions of the diaphragm which have been ound by trial to permit of the assage of de; sired amounts of material. T e position of the diaphragm 21 is adjusted in a similar manner by means of a screw 30.

In making concrete, the cement may be placed in the hop er3, the sand in the hopler 4, and the bro en stone in the hopper 5. Ihis order is preferable when making concrete, as the materials needed in smaller quantities are fed to the conveyer at the smaller end of the screw; however, the order mentioned is not essential.

It is desirable to provide against choking ofv the apparatus by reason of pieces of stone becoming caught between the conveyer and some" portion of the hopper from which the brokenlsqtone is being fe To guard against such choking, I make a portion of the hopper ywall adjacent to the outlet from the conveyer yielding or elastic. Said yielding wall consists of a plurality of s ring blades 31 attached at their upper en s to the hopper 5, and extending to a point near the eriphery of the conveyer screw 18. -The bla es 31 are stiff enough to withstand the pressure due to the ordinary weight of -the material in the hopper, but will yield to permit the passage of a piece of stone that might become wed ed between the conveyer screw and said bla es. A plurality of narrow blades is used, in preference to a single wider blade, in order that the yielding action shall be local, and to avoid forming such a large opening as to ermit an excessive amount of .materia to esca e-from theho per 5.

T e materials fe forward by the conveyer screw 18 are discharged by said screw into a mixing trough 32 where they are thoroughly mixed by means of paddles or blades 33 fixed to thev shaft 12. In order that the (S0/mixed materials may be fed toward the forward open end of the trough 31 by the rotation ofthe blades 33, said blades are set at an angle with the shafty 13. To guard against any of the pieces of broken stone becoming wedged between the blades 33 and the sides of the trough 32, said blades are arranged so as to leave a space between their outer ends and the walls of the trough. This space, as hereinbefore suggested, becomes filled with a mass of material which may harden and form an objectionable crust. To permit of readily removing this layer of material at suitable intervals, I mount the trough 32 in such a manner` that it may be rocked from its normal or operative position into inoperative positions wherein lts bottom and the lower portions of its sides are close to the blades 33. Referring to Fig. 3, 34 are brackets rigidly iixed in pairs to the longitudinal beams 1, four pairs of brackets being provided in the resent instance. The outer ends of said rackets carry pins 35 whichA pass through elongated openings 36 formed in lugs 37 fured to the trough 32. A tilting lever 38 is sulpported in a bracket 39 fixed to one of tie beams 1, which lever is pivotally connected with ears 40 fixed to one of the sides of the 'by the screw conveyer 17 into the mixing trough 32, Iwhere water is added and the mixing completed. As the screw conveyer delivers all the diHerent materials into the mixing trough at one point, said materials are quickly and uniformly mixed by the blades 33. It will be seen that the cement, sand and stone will be quite thoroughly mixed in their passage through the conveyer, thus making ossible the use of a smaller mixing trou h than is usual in mixing machines. It shou d also be noted that the em loyment of a conical conveyer makes possib e the use of several hoppers. If the screw were of uniform diameter it ,could empty but one hopper, but being conical its increased diameter on the portion beneath each successive hopper permits the entrance of additional material at each point in its length. At suitable intervals the trough 32 is rocked by means of the lever 38 to bring rst one side and then the other of said trough up to the revolving paddles 33, in order'to scrape off the concrete adhering to the sides and bottom of the trough. In thus rocking the trough, say to theright, it is lifted off the supporting pins 35 upon the left s ide, the trough being guided back to its normal position by means of the slotted lugs 37. i

Various changesmay be made bodiment herein shown without departing from the spirit and scope of my invention. I

inthe em-` soy means vfor tilting one `side lof said trough free ofsaid pins, and `means for guiding said trough back to its normal position'upon said pms.y e p 2. In a mixing apparatus, in combination, a mixing trough; a support for said trough at opposite sides thereof; mixing devices in said trough; and means interposed between one of 4said supports and said trough formovin said trough rst oli lone support and then o the other toward said mixing devices.

v ing one side of sai 3. In a mixing apparatus, in combination, amixin trough; a support for said trough at each 'si e thereof, mixing devices in said trough; means engaging said trou h for tilttrough free of t e support for that side; and means en aging said trough for guiding said trough bac to said support.

4. In a mixing apparatus, in combination,

a non-rotatable non-sectional mixing trough; a supporting frame comprisin brackets at each vside of said mixing troug upon which said trough is movably su orted; mixing devices in said trou h mova le with relation to said trough;'an means for moving said trough upon said brackets.

5. A concrete mixer comprising a supporting frame; a non-rotatable, non-sectional mixing troughya supporting means in said `framefor said trough at opposite sides of said trough, the supporting means at each side of said trough belng adapted to serve as a separate pivot for the entlretrough; mixing de-l vices in said trough; and a lever pivoted in said'rame and connected with said troughl -for moving the latter toward an'd away from the mixing devices.

6. A concrete mixer comprising a mixing trough; supports for said trough at opposite .-sides thereof; a pivotal connection betweenA said trough and said sup orts; movable mix- 'ing devices in said trougllr; said pivotal connection permitting ja movement of said trough toward and' away from said-mixing devices, and ans for moving said trough upon said supports from its operative osition 'to an inoperative position in whic inoperative posltlon the walls of said trough- .are closer to said mixing devices than when said trough is in the operative position.

7 In a mixing apparatus, in combination,

a supporting frame, comprising brackets provided with pins; a mixing trou h; lugs at op-v posite sides of said trough, said 1u s having elongated openings therein into W ch said pins extend; means for tilting said trough on said pins; and devices in said. trough.

JOHN A. SVENSON..

. Witnesses:

- F. B. TOMB, ALICE A. .TRILL 

